PCI Express
- PCI-SIG - PCI Express
http://www.pcisig.com/specifications/pciexpress/
The fundamental purpose of the PCI-SIG is to deliver a stable, straightforward and compatible standard for PCI devices. PCI-SIG members may download the specifications for free; non-members are invited to purchase the specifications. - Intel® Developer Network for PCI Express* Architecture
http://www.intel.com/technology/pciexpress/devnet/
Information about Intel® Developer Network for PCI Express* Architecture